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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    //声明一个对象
    const banji = {
      name: '终极一班',
      stus: ['xiaoming','xiaoli','xiaozhang'],
      [Symbol.iterator](){
        //声明索引
        let index = 0
        //保存this
        let _this = this
        return {
          next:function(){
            if(index < _this.stus.length){
              const result = {value: _this.stus[index], done: false}
              index++
              return result
            }else{
              return result = {value: undefined, done:true}
            }
          }
        }
      }
    }

    for(let v of banji){
      console.log(v)
    }
  </script>
</body>
</html>